#!/usr/bin/env python
import os
from setuptools import find_packages, setup

import torch
from torch.utils.cpp_extension import BuildExtension, CppExtension, CUDAExtension


def readme():
    with open("README.md", encoding="utf-8") as f:
        content = f.read()
    return content


version_file = "mmdet/version.py"


def get_version():
    with open(version_file, "r") as f:
        exec(compile(f.read(), version_file, "exec"))
    return locals()["__version__"]


def make_cuda_ext(name, module, sources, sources_cuda=[]):

    define_macros = []
    extra_compile_args = {"cxx": []}

    if torch.cuda.is_available() or os.getenv("FORCE_CUDA", "0") == "1":
        define_macros += [("WITH_CUDA", None)]
        extension = CUDAExtension
        extra_compile_args["nvcc"] = [
            "-D__CUDA_NO_HALF_OPERATORS__",
            "-D__CUDA_NO_HALF_CONVERSIONS__",
            "-D__CUDA_NO_HALF2_OPERATORS__",
        ]
        sources += sources_cuda
    else:
        print(f"Compiling {name} without CUDA")
        extension = CppExtension

    return extension(
        name=f"{module}.{name}",
        sources=[os.path.join(*module.split("."), p) for p in sources],
        define_macros=define_macros,
        extra_compile_args=extra_compile_args,
    )


def parse_requirements(fname="requirements.txt", with_version=True):
    """Parse the package dependencies listed in a requirements file but strips
    specific versioning information.

    Args:
        fname (str): path to requirements file
        with_version (bool, default=False): if True include version specs

    Returns:
        List[str]: list of requirements items

    CommandLine:
        python -c "import setup; print(setup.parse_requirements())"
    """
    import sys
    from os.path import exists
    import re

    require_fpath = fname

    def parse_line(line):
        """Parse information from a line in a requirements text file."""
        if line.startswith("-r "):
            # Allow specifying requirements in other files
            target = line.split(" ")[1]
            for info in parse_require_file(target):
                yield info
        else:
            info = {"line": line}
            if line.startswith("-e "):
                info["package"] = line.split("#egg=")[1]
            elif "@git+" in line:
                info["package"] = line
            else:
                # Remove versioning from the package
                pat = "(" + "|".join([">=", "==", ">"]) + ")"
                parts = re.split(pat, line, maxsplit=1)
                parts = [p.strip() for p in parts]

                info["package"] = parts[0]
                if len(parts) > 1:
                    op, rest = parts[1:]
                    if ";" in rest:
                        # Handle platform specific dependencies
                        # http://setuptools.readthedocs.io/en/latest/setuptools.html#declaring-platform-specific-dependencies
                        version, platform_deps = map(str.strip, rest.split(";"))
                        info["platform_deps"] = platform_deps
                    else:
                        version = rest  # NOQA
                    info["version"] = (op, version)
            yield info

    def parse_require_file(fpath):
        with open(fpath, "r") as f:
            for line in f.readlines():
                line = line.strip()
                if line and not line.startswith("#"):
                    for info in parse_line(line):
                        yield info

    def gen_packages_items():
        if exists(require_fpath):
            for info in parse_require_file(require_fpath):
                parts = [info["package"]]
                if with_version and "version" in info:
                    parts.extend(info["version"])
                if not sys.version.startswith("3.4"):
                    # apparently package_deps are broken in 3.4
                    platform_deps = info.get("platform_deps")
                    if platform_deps is not None:
                        parts.append(";" + platform_deps)
                item = "".join(parts)
                yield item

    packages = list(gen_packages_items())
    return packages


if __name__ == "__main__":
    setup(
        name="mmdet",
        version=get_version(),
        description="OpenMMLab Detection Toolbox and Benchmark",
        long_description=readme(),
        long_description_content_type="text/markdown",
        author="OpenMMLab",
        author_email="openmmlab@gmail.com",
        keywords="computer vision, object detection",
        url="https://github.com/open-mmlab/mmdetection",
        packages=find_packages(exclude=("configs", "tools", "demo")),
        classifiers=[
            "Development Status :: 5 - Production/Stable",
            "License :: OSI Approved :: Apache Software License",
            "Operating System :: OS Independent",
            "Programming Language :: Python :: 3",
            "Programming Language :: Python :: 3.6",
            "Programming Language :: Python :: 3.7",
            "Programming Language :: Python :: 3.8",
        ],
        license="Apache License 2.0",
        setup_requires=parse_requirements("requirements/build.txt"),
        tests_require=parse_requirements("requirements/tests.txt"),
        install_requires=parse_requirements("requirements/runtime.txt"),
        extras_require={
            "all": parse_requirements("requirements.txt"),
            "tests": parse_requirements("requirements/tests.txt"),
            "build": parse_requirements("requirements/build.txt"),
            "optional": parse_requirements("requirements/optional.txt"),
        },
        ext_modules=[],
        cmdclass={"build_ext": BuildExtension},
        zip_safe=False,
    )
